Improvement in apparatus for dressing and furrowing millstones



JAMES LEE NORTON.; OF LONDON, ENGL-AND'.

Letters Patent No. 110,064, dated December "13, 1870;

,IMPROVEMENT IN APPARATUS FOR DRESSING AND FURROWING MILLSTONES.

The Schedule referred to in these Letters Patent and making. part of the same.

To all` to whom it may concern:

Beit known that I, J AMES LEE NORTON, ot" Belle Sauvage Yard, Ludgate Hill, in the city of London, England, a. subject of the Queen of Great Britain, have invented ordiscovered new and useful Improvements in Apparatusfor Dressing and Furrowing Millstones, and I, the said JAMES LEE NORTON, do hereby declare the nature of the said invention, and in what manner thesame is to be performed, to be particularly described and ascertained in and by the following statement thereof, that is to say,

This invention has for its object improvements in apparatus for dressing and furrowing millstones.

For this purpose Iv employ a curved base surfaced on the under side. This base is to rest upon the skirt of the stone and follow its curve.

Upon this base a slide is mounted, so as to be capable of moving along from end to end in' a curved course.

The slide carries a vertical axis with van arm upon it, and at the end of the arm is a tool-carrier and tool. Thetool is a cutting-diamond, gem, or other A cutter.

.lhe` arm with the tool-carrier and tool are moved yto and fro by the workman, and so curved lines are cut upon the face of the stone.

The 'spaces between' the lines.- are given by the movement off the slide upon the base, to effect which rack-teeth are provided upon the base, and a worm, mounted on the slide, engages with them. y

The-worm takes its .motion from a ratchet-wheel, which, by a lever and pawl, is turned-one or more teeth for each stroke of the cutter.

If it be desired, in place of dressing the stone to a true plane all over, to make the'suriaceincline from. the skirt to the eye, I employ a template to govern lthe tool-holders.

c is a slide, cap. ble of traversing ina curved course along the bed b.

d is a vertical axis, carried in bearings by the slide, and having upon it an arm, e, to which is jointed the lever f carrying an adjustable tool-holder and tool.

In the operation of dressing the stone the arm 'e has a to-and-fro motion' given to it around its axis by means of -its-handle e'.

During these motions the lever f is controlled by the guide g fixed to the slide, the lever being made to clip the guide, as is shown, so that the vertical movement of the cutter, as it traverses over the face of the stone, is dependent entirely on the form given to the guide.

The guide is. so formed as to cause theA tool to cnt more deeply as it approaches the eye than when it is operating on the skirt Ot' the stone.

In order that the slide c may be traversed the -requisite short distance onthe slide between the successive passages ot' the tool over the face of the stone, rack-teeth are formed on the bed at b", and with these teeth the' worm c", which is carried in bearings on the l slide-gears.

A ratchet-wheel is fixed on the axis of the worin, and it is driven by a lever and a pawl, h.

At each stroke ofthe arm e ajprojectiou upon it strikes the lever and imparts to it the requisite motion, a weight causes.the retu'rulof the lever; the pawl is capable of being turned from one side to the other to produce a rotation in the opposite direction.

Having thus described the nature of my invention and the mann'erof performing the same, I would have it understood that 1. The combination of the curved statt' or base, the slide c to traverse upon it in a circular course, the vertical axis d, and the arm ve supporting the cuttingpoint, substantially as described, and shown lby the drawing.

2. The combination ot the template g to govern the course of the tool, with the lever f, arm e, axis d, and slide o, substantially as described, and shown bv the drawing.

J. L. NORTON'.

Witnesses WILMER M. Hamers; Both ofNo.17 GmaclHoMAs LAKE. church street, London. 

